Journal ArticleDOI
Monitoring of respiratory and heart rates using a fibre-optic sensor.
TLDR
The results provide evidence that it is possible to monitor respiratory and heart rates using the reflection mode of photoplethysmography (PPG), and the method is suitable for the observation of both adults and neonates, in hospitals as well as in other environments.Abstract:
A new method, which uses a fibre-optic probe to monitor respiratory and heart rates simultaneously, has been developed and evaluated. The results provide evidence that it is possible to monitor respiratory and heart rates using the reflection mode of photoplethysmography (PPG). The fibre-optic probe makes it possible to monitor from different sites on the patient, and the method is convenient to use. In addition, the probe is X-ray transparent, insensitive to electromagnetic interference (e.g. during MRI investigation) and may be made very light and small. Therefore the method is suitable for the observation of both adults and neonates, in hospitals as well as in other environments.read more
Citations
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Journal ArticleDOI
Photoplethysmography and its application in clinical physiological measurement.
TL;DR: Photoplethysmography is a simple and low-cost optical technique that can be used to detect blood volume changes in the microvascular bed of tissue and is often used non-invasively to make measurements at the skin surface.
Journal ArticleDOI
How accurate is pulse rate variability as an estimate of heart rate variability?: A review on studies comparing photoplethysmographic technology with an electrocardiogram
Axel Schäfer,Jan Vagedes +1 more
TL;DR: Studies investigating the accuracy of PRV as an estimate of HRV, regardless of the underlying technology, speak in favor of sufficient accuracy when subjects are at rest, although many studies suggest that short-term variability is somewhat overestimated by PRV.
Journal ArticleDOI
Critical review of non-invasive respiratory monitoring in medical care
TL;DR: The field of non-invasive respiratory monitoring is still in an exploratory phase, with numerous reports on specific device solutions but less work on evaluation and adaptation to clinical requirements, andMiniature CO2 sensors are identified as one route towards substantial improvement.
Journal ArticleDOI
Monitoring of heart and respiratory rates by photoplethysmography using a digital filtering technique
TL;DR: An apparatus for simultaneously monitoring heart and respiratory rates was developed using photoplethysmography (PPG) and digital filters, and compared with conventional methods.
Journal ArticleDOI
An assessment of algorithms to estimate respiratory rate from the electrocardiogram and photoplethysmogram
Peter Charlton,Timothy Bonnici,Timothy Bonnici,Lionel Tarassenko,David A. Clifton,Richard Beale,Peter J. Watkinson +6 more
TL;DR: The primary aim was to determine how closely algorithms agreed with a gold standard RR measure when operating under ideal conditions, and to provide a toolbox of algorithms and data to allow future researchers to conduct reproducible comparisons of algorithms.
References
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Journal ArticleDOI
The Optics of Human Skin
R. Rox Anderson,John A. Parrish +1 more
TL;DR: An integrated review of the transfer of optical radiation into human skin is presented, aimed at developing useful models for photomedicine.
Journal ArticleDOI
Measurement of the separate volume changes of rib cage and abdomen during breathing
TL;DR: A high degree of volume dependence between the rib cage and abdomen was demonstrated under isovolume conditions, while a high level of volume independence between these parts was demonstrated when total volume change was unconstrained.
Journal ArticleDOI
Skin photoplethysmography--a review.
TL;DR: The photoplethysmograph has been used for over 50 years but there are still misconceptions in how and what is the information obtained about the autonomic nervous system control of the cardiovascular system.
Journal ArticleDOI
Quantitation of rhythmic diameter changes in arterial microcirculation
TL;DR: The diameter of the arterial and arteriolar blood vessels was measured as a function of time in the hamster skin fold window preparation and suggests that this phenomenon is due to local pacemaker activity of groups of unitary smooth muscle cells.
Rhythmical variations in human skin blood flow.
TL;DR: It was concluded that the oscillatory variations in skin blood flow are intimately associated with the rhythmical active vasomotion (small vessel rhythmical diameter changes) reported previously in the literature.